JP2745313B2 - Toggle mechanism - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a toggle mechanism driven under the control of an NC control device.

2. Description of the Related Art A toggle mechanism is used in many industrial devices, and with the automation of these industrial devices, precise operation by NC control is often required.

To operate the toggle mechanism with the NC controller, set the mechanical origin of operation to the toggle mechanism and set the position to NC
It is necessary to make the control device memorize it as the control origin,
In addition, in order to maintain accurate operation, it is necessary to constantly monitor the mechanical origin and the control origin for deviations, and to adjust correctly if there is a deviation.

In particular, it must be performed when there is a possibility that the balance regarding the position of each part may fluctuate, for example, after replacing a power transmission member such as a ball screw for driving the expansion and contraction of the toggle mechanism, or after replacing peripheral parts such as a pulley.

Looking at the toggle mechanism in the mold clamping part of the injection molding machine, as shown in FIG. 3, the toggle mechanism 1 is attached by connecting the rear platen 2 and the movable platen 3, and basically, one end of the first link 4. Is rotatably connected to a staple 2 'on the rear platen 2 side by a first toggle pin 5, and one end of a second link 6 is a staple 3' on the movable platen 3 side.
The other end of the first link 4 and the other end of the second link 6 are rotatably connected by a third toggle pin 8. .

The mechanical origin position for the operation of the toggle mechanism 1 is determined when the mold clamping is completed, that is, when the connecting portions 9, 10, 11 (FIG. 4) of the links 4, 6 are fully extended, and the respective toggle pins 5, 7, 8 are extended. Are set in a state where the center points of are aligned.

Therefore, in order to monitor the home position, the NC controller issues a command regarding the home position return of the toggle mechanism 1, and the alignment status of the toggle pins 5, 7, 8 at that time is changed to the straight edge 12 (length 1m) as shown in FIG. , Width 5-10mm) for each toggle pin 5,7,8
To check whether there is a gap between each pin and the straight edge 12.

This inspection method is applicable not only to the toggle mechanism in the mold clamping portion of the injection molding machine but also to a toggle mechanism having a similar structure in which the extended state is set as the mechanical origin position.

However, in the conventional toggle mechanism 1, as shown in FIG. 5, each of the toggle pins 5, 7, 8 has its end face 13 substantially the same as the side face of the connecting portion 14. Since there is no protrusion to be placed, when detecting the above-mentioned alignment situation, the pin cover 2 is removed and one end of each of the toggle pins 5, 7, 8 is struck out from the opposite side with a hammer or the like.

This work must be performed in a complicated space in which a mechanism for driving the toggle mechanism and a support structure such as a tie rod in an injection molding machine are intricate, and it is difficult and damages other parts. There is even a fear that it will.

SUMMARY OF THE INVENTION An object of the present invention is to provide a toggle mechanism that can easily inspect a mechanical origin position using a straight edge.

Means for Solving the Problems In the toggle mechanism, each toggle pin connecting each link is configured to protrude to the side of the connecting portion on the same side by the amount of the straight edge mounted.

In the case of the key fixing method in which the toggle pin and the staple or the link are fixed by a key, the peripheral opening of the key groove formed at the end of the toggle pin is set to a position that does not become the upper part when the toggle mechanism is extended.

In the case of the key fixing method in which the toggle pin and the staple or the link are fixed by a key, an annular body having the same thickness and the same diameter is provided so as to be freely detachable from the end of the toggle pin.

Action The protrusion of each toggle pin in the toggle mechanism always provides a straight edge rest.

In the key fixing method, a configuration in which the peripheral opening of the key groove does not become the upper part when the toggle mechanism is extended makes the measurement by the straight edge accurate.

In the key fixing method, the configuration in which the annular body is removably fitted allows accurate measurement by the straight edge regardless of the position of the peripheral opening of the key groove.

Embodiment FIG. 3 shows a mold clamping portion of an injection molding machine,
And a fixed platen 14 are connected by a tie rod 15 and arranged in parallel, and the movable platen 3 is fitted to the tie rod 15 so as to be slidable forward and backward (right in the figure is forward). The rear platen 2 and the movable platen 3 are connected by an upper and lower toggle mechanism 1 arranged in parallel.

The toggle mechanism 1 is the same as that described above, and the first and second links 4, 6 are connected to the staple 2 'on the rear platen 2 side via the first, second, and third toggle pins 5, 7, 8 and the movable platen. The other end is connected to the staple 3 'on the third side.

FIG. 3 shows the different situation of the same mold clamping part as the mold clamping axis m.
The upper part shows the mold closing completion state in which the toggle mechanism 1 is extended, and the lower part shows the mold opening completion in which the toggle mechanism 1 is the most contracted.

The upper and lower toggle mechanisms 1 are connected to a central crosshead 16 by a connecting link 17. One end of the coupling link 17 is rotatably connected to the middle of the first link 4, and the other end is rotatably connected to the crosshead 16. A front end of a ball screw 18 rotatably supported by the fixed platen 2 is rotatably mounted on the crosshead 16, and a rear portion of the ball screw 18 is screwed by a ball nut 19 rotatably supported by the solid platen 2. Have been combined. When the nut 19 is driven and rotated by the mold clamping motor 20, the ball screw 18 moves back and forth, and expands and contracts the upper and lower toggle mechanisms 1 via the crosshead 16.

In addition, the mold clamping unit of the injection molding machine includes an ejector mechanism, a mold thickness adjusting mechanism, and the like in addition to the illustration, but the description thereof is omitted.

In the toggle mechanism 1 of the first embodiment, as shown in FIGS. 1 and 2, the first link 4 and the second link 6 are connected to the connecting portions 9, 10, and 11 via the toggle pins 5, 8, and 7, respectively. (FIG. 1), and each of the toggle pins 5, 8, and 7 has the same end (in this case, both ends) protruding d = 10 mm from the side surface of the connecting portion in each connecting portion. I have.

In FIG. 2, reference numeral 21 denotes a bush made of oil metal or the like, and toggle pins 5 and 5 are provided at connecting portions 9, 10 and 11.
It is installed where there is relative rotation with 7, 8. Both end faces 13 of the toggle pins 5, 8, 7 are protected by pin covers 22. Reference numeral 23 denotes a retaining pin.

In the inspection of the mechanical origin position, an origin return command is issued from the NC control device to extend the toggle mechanism 1, the pin cover 22 is removed, and the straight edge 12 is wrapped around each of the toggle pins 5, 8, 7 as in the prior art. Then, it may be determined whether or not each of these pins is in contact with the edge 12. If an allowable error is found, the gap between the toggle link and the storage edge 12 is inspected using a shim or the like.

If there is a gap as a result of the inspection and there is a difference between the control origin position set in the NC controller and the position where the toggle mechanism 1 has fully extended, that is, the mechanical origin position, the toggle mechanism 1 is shifted from the current state. Investigation of the amount of rotation of the mold clamping motor 20 required to extend the motor, etc., and performing an origin position adjustment operation for correcting the setting of the origin position for control in the NC control device.

FIGS. 6 to 8 show a second embodiment, in which first, second, and third toggle pins are provided at the connecting portions 9, 10, and 11 of the first embodiment.
5, 7 and 8 are staples 2 'on the rear platen side, 2nd link 6
Are fixed by keys 24 (FIG. 6) at both ends.

Looking at the connection portion 9, the first toggle pin 5 connects the first link 4 to the rear platen side staple 2 ′, and an end protrudes to the side of the connection portion.

At this end, there is a key groove 25 that passes through in the diametric direction.
It is formed slightly deeper than the protrusion of the toggle pin 5 in the axial direction from 13. A key receiving groove 26 corresponding to the key groove 25 is formed in the side surface of the rear platen side staple 2 'in the horizontal direction.

A sturdy key 24 is fitted over the key groove 25 and the key receiving groove 26 (FIG. 6), and the key 24, the first toggle pin 5 and the staple 2 'on the rear platen side are connected to the bolt 2 by bolts 2.
Fix each at 7, 28 (Fig. 7).

The same applies to the second and third connecting portions 10 and 11,
The second toggle pin 7 and the third toggle pin 8 are provided at both ends of the side surface of the second link 6 with a key 24 and bolts 27 and 28, respectively.
Fixed at. In this case, all the key receiving grooves 26 provided on the second link 6 side are formed horizontally, that is, as shown in FIG. 8, when the toggle mechanism 1 is extended, the peripheral side of the key groove 25 at the end of each toggle pin. The toggle pin and the staple or link are fixed at a position where the opening does not become the upper part.

According to this, since the first toggle pin 5 is reliably prevented from rotating together with the first link 4, the bush 21 is not required for the rear platen side staple 2 '. Also, the sturdy key 24 prevents the staples 2 'and the first link 4 from sliding in the axial direction of the first toggle pin 5, so that the toggle mechanism expands to the side when the mold clamping operation locks up. To prevent the mold from exerting a sufficient mold clamping force.

Further, the key groove 25 of each toggle pin 5, 7, 8 is key-fixed to the staple or link at a position where the opening does not become the upper part when the toggle mechanism 1 is extended. The edge surface does not come into contact with the opening on the peripheral side of the key groove 25, so that measurement failure does not occur.

FIG. 9 shows a third embodiment. In the key fixing type toggle mechanism 1 as in the second embodiment, the key grooves 2 at the ends of the toggle pins 5, 7, 8 are unavoidable from the viewpoint of machining.
In order to cope with the case where the peripheral edge opening 5 opens upward when the toggle mechanism 1 is extended, the thickness of the end of each of the toggle pins 5, 7, 8 protruding to the side of the connecting portion is increased. And an annular body 29 (FIG. 10) having the same diameter as that of the annular body 29.

In this embodiment, when the straight edge 12 is used, the annular body 29 is fitted to each end, and the edge is placed on the upper outer periphery. Check if you are in an acceptable alignment.

According to this, even if the peripheral edge opening of the key groove 25 is open at the top, the contact point with the straight edge 12 is irrelevant, so that accurate measurement can be performed.

In this embodiment, when the key receiving groove 26 is formed in a large, heavy, and difficult to change posture, such as the staple 2 'of the rear platen or the staple 3' of the movable platen 3, the vertical key receiver is easy to work. Even if it is formed in the groove 26, no trouble occurs and it is convenient.

Effects of the Invention Since the inspection using the straight edge 12 can be performed without hitting the toggle pin of the toggle mechanism, the work of adjusting the origin position of the toggle mechanism in an injection molding machine or the like is simple.

[Brief description of the drawings]

FIG. 1 is a schematic plan view, FIG. 2 is a horizontal sectional view of a main part, FIG. 3 is a front view of a mold clamping part in an injection molding machine, FIG. The figure is a horizontal sectional view of the main part.
FIG. 7 is a perspective view showing a main part of the second embodiment, FIG. 7 is a front view of the main part, FIG. 8 is a front view of the same, FIG. 9 is a front view of the third embodiment, and FIG. It is a perspective view of a principal part. DESCRIPTION OF SYMBOLS 1 ... Toggle mechanism, 2 ... Fixed platen, 3 ... Movable platen, 4 ... 1st link, 5 ... 1st toggle pin, 6 ... 2nd link, 7 ... 2nd toggle pin, 8 ... 3rd toggle pin, 9.1
0,11… Connection part, 12… Straight edge, 13… End face, 14…
Fixed platen, 15… Tie rod, 16… Crosshead, 17
… Coupling link, 18… Ball screw, 19… Ball nut, 20
... Mounting motor, 21 ... Bushing, 22 ... Pin cover, 23 ... Retaining pin, 24 ... Key, 25 ... Key groove, 26 ... Key receiving groove,
27, 28 ... bolt, 29 ... annular body.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kazunari Iribe 3580 Kobaba, Ogino-za, Oshino-mura, Minamitsuru-gun, Yamanashi FANUC CORPORATION Product Development Research Center

Claims (3)

(57) [Claims] An end of a first link is rotatably connected to a rear platen side staple with a first toggle pin, and an end of a second link is rotatably connected to a movable platen side staple with a second toggle pin. Further, the other end of the first link and the second
A toggle structure in which the other end of the link is rotatably connected by a third toggle pin, wherein the first, second, and third toggle pins have the same end on the same side as the straight edge mounting portion. A toggle mechanism characterized by being mounted so as to protrude to the side. 2. A key groove is formed at an end of each toggle pin, and the toggle pin and the staple or link are key-fixed at a position where the peripheral opening of the key groove does not become an upper part when the toggle mechanism is extended. The toggle mechanism according to claim 1. 3. A toggle groove is formed at the end of the toggle pin to fix the toggle pin and the staple or link together, and at these ends, annular bodies having the same thickness and the same diameter are provided so as to be freely detachable. The toggle mechanism according to claim 1, wherein: